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Suitable ARM Family for Fire Control Panels

Hello,

I will start to develop an Embedded software for Fire Control Panels. The needed functions are IO Controls, RS485 Interfaces, Keypad Interface, LCD interface(Text or Graphics). This should be done with Hard Real Time Constraints. I do not know which ARM family is suitable for this kind of projects. It is enough to use Cortex M3 Micros or I have to upgrade to higher families?